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British police who travelled to Thailand to review the investigation into the murders of backpackers Hannah Witheridge and David Miller are due to return to the UK, having completed their work "as far as possible".

Metropolitan Police officers flew out to the Thai island of Koh Tao last month to work with the Royal Thai Police after an agreement between David Cameron and military ruler General Prayuth Chan-ocha.

Hannah Witheridge and David Miller were discovered on a beach on Koh Tao.

It followed international concern about the way the case has been handled by the Thai authorities.

Mr Miller, 24, from Jersey, and 23-year-old Ms Witheridge, from Great Yarmouth in Norfolk, were found dead on a beach in September.

Scotland Yard said the British officers will compile a report from their review.

Police in Thailand are offering a reward of more than £13,000 to try to catch the killers of two British tourists.

David Miller, a Leeds University student, and fellow traveller Hannah Witheridge were murdered in Thailand. Their bodies were discovered on a beach on the island of Koh Tao on September 15th.

A group of footballers have been questioned by detectives investigating the brutal murders.

A bloodstained garden hoe, believed to be the murder weapon, was found nearby.

A spokesman for the Royal Thai Police confirmed that DNA samples were taken from "more than eight" footballers - who reportedly threw a late-night party at the nightclub where the victims spent their final hours - and officers were awaiting the results.

Police colonel Kissana Phathanacharoen said a reward of 700,000 baht is now being offered for information which leads to the arrests of those responsible.

"We are working around the clock. We are trying to narrow our inquiries and collect more evidence. We are encouraging the public who many have information to come forward.

"We are checking DNA but this is not the only thing we are looking at to prosecute the suspects."

Media reports in Thailand claim police are almost ready to arrest and charge more than one suspect over the murders of former Leeds University student David Miller and fellow backpacker Hannah Witheredge.

The Broadcast outfit Thai PBS quotes Southern police chief Pol Lt-Gen Panya Mamen as saying police have now gained enough evidence to arrest more than one person over the murder of the two British tourists in Koh Tao.

He is said to have "expressed confidence' that they will be arrested and charged within this week.

It's also reported that police have dismissed news report that the tourists might have been killed by local mafias after having heated argument with them. And that two suspects who were speed boat employees had been cleared after DNA testing did not match that found at the scene and on one of the bodies.

Police investigating the murder of former Leeds University student David Miller and fellow backpacker Hannah Witheridge have released the 12 suspects after DNA samples collected from the victims and the scene do not match any of them.

"Police have collected a lot of evidence and interviewed many people, and this should help us find the culprits.

"There is a lot of evidential information that we cannot reveal to the media right now.

"Sadly, the clues revealed so far have proved to be blank and the suspects have been released.

"From the available evidence, we believe that there were more than two attackers.
"I am well aware that the murders have affected Thailand's reputation and travellers' confidence. I'm asking for more time as I want to work on a step-by-step basis,"